TK711, TK721, TK722 and TK732 Track Feller Bunchers Hydraulic System Swing Speed and Swing Drift on a Slope - Check Caterpillar


Swing Speed and Swing Drift on a Slope - Check
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Measuring the swing speed on a slope will determine if there is a need to check the swing motor and the anti-reaction valve. Measuring the swing drift on a slope will determine if there is a need to check the swing parking brake.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, "Piston Motor (Swing Drive) Relief Valve Pressure - Test and Adjust".

Table 1
Required Tools    
Part Number     Description     Qty    
5P-3277     Measuring Tape     1    
    Stopwatch     1    



Illustration 1g00298078

  1. Complete the following steps in order to measure the swing speed on a slope.

    1. The felling head should be empty.

    1. Position the machine on a slope of 12 degrees. Refer to Illustration 1.

    1. Position the implements at maximum reach. Position the felling head above the ground so that the felling head will not come in contact with any obstacles.



      Illustration 2g00298079

    1. Position the upper structure at position (A). The upper structure should be at a 90 degree angle to the lower structure. Refer to Illustration 2.

    1. Measure the time that is required to swing the upper structure from position (A) to position (B) .

    1. Position the upper structure at position (C). The upper structure should be at a 90 degree angle to the lower structure.

    1. Measure the time that is required to swing the upper structure from position (C) to position (B).

      Table 2
      Swing Time (seconds)    
      Item     New    
      Right Swing     5.2 or less    
      Left Swing    

  1. Complete the following steps in order to measure the swing drift on a slope.



      Illustration 3g00298079

    1. Position the upper structure at position (A). The upper structure should be at a 90 degree angle to the lower structure. Refer to Illustration 3.



      Illustration 4g00790167

      (A) Upper frame. (B) Undercarriage frame. (C) Marking.

    1. To indicate the relationship of the two positions, put a mark (C) on the inner race and the outer race of the swing bearing. Refer to Illustration 4.

    1. Stop the engine.

    1. Leave the machine in this position for three minutes. Measure the swing drift on the circumference of the swing bearing.

    1. Start the engine.

    1. Position the upper structure at position (C). The upper structure should be at a 90 degree angle to the lower structure. Refer to Illustration 3.

    1. Repeat Steps 2.b through 2.d.

Table 3
Swing Drift mm (inch)    
Item     New    
Right Swing     0    
Left Swing    

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